https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105807
Bug ID: 105807
Summary: ICE / error when defining a class containing
polymorphic components
Product: gcc
Version: 11.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: bourdin at mcmaster dot ca
Target Milestone: ---
defining a class whose components are polymorphic variables fails:
Consider the following (legal) source code:
module Vect_class
type, abstract :: Vect_Type
end type
end module Vect_class
module Elem_class
use Vect_class
type, abstract :: Elem_Type
integer :: numDof
class(Vect_type),allocatable :: v
end type
end module Elem_class
module Vect
use Vect_class
type, extends(Vect_Type) :: Vect2D
real :: X,Y
end type Vect2D
type, extends(Vect_Type) :: Vect3D
real :: X,Y,Z
end type Vect3D
end module Vect
module Elem
use Elem_class
type, extends(Elem_type) :: elem2D
end type
end module Elem
program testElem
use Vect_class
use Vect
use Elem_class
use Elem
type(Vect2D) :: a
type(Vect3D) :: b
class(Vect_type),allocatable :: c,d
class(Elem_type),allocatable :: e
real :: x,y,z
x = 1.0
y =-2.0
z = 3.0
a = Vect2D(x,y)
b = Vect3D(x,y,z)
c = Vect2D(x,y)
d = Vect3D(x,y,z)
e = Elem2D(10,b)
write(*,*) e%numDof
end program testElem
It fails to compile with error message with GNU Fortran (GCC) 11.2.1 20210728
(Red Hat 11.2.1-1) (RHEL7 devtoolset 11)
53 | e = Elem2D(10,b)
| 1
Error: Cannot convert TYPE(vect3d) to CLASS(__class_vect_class_Vect_type_a) at
(1)
Under macOS (monterey, M1 processor) GNU Fortran (Homebrew GCC 11.3.0_1)
11.3.0, I get an ICE:
TestNestedClass3.f90:53:20:
53 | e = Elem2D(10,b)
| 1
internal compiler error: in fold_convert_loc, at fold-const.c:2563
